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1. In human beings, a downward-pointed frontal hairline ("widow's peak") is a heritable trait. A
person with a widow's peak always has at least one parent who also has this trait, whereas
people with a straight frontal hairline may occur in families in which one or even both parents
have widow's peaks. When both parents have a straight frontal hairline, all children also have
a straight hairline. Using A and a to symbolize alleles for this trait, what is the genotype of an
individual without a widow's peak? (Show your work)

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The genotype of an individual without a widow's peak would be aa.

  • A person with widow's peak has. at least a parent with the trait.
  • When both parents have a straight frontal hairline, all the children also have a straight frontal hairline.

The above features are indications that widow's peak is a dominant trait.

Since A and a are used to represent the alleles, AA or Aa will be the genotype of individuals with widow's peak while only aa will be the genotype of individuals with straight frontal hairlines.

In other words, individuals without a widow's peak will have aa as genotypes.

More on dominant traits can be found here:  https://brainly.com/question/911860?referrer=searchResults

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